Speaking to Collider, Ellen Page talked about returning to work in X-Men: Days of Future Past:

I didn’t expect to play Kitty Pryde again, so when that came up and I met with Bryan, because I didn’t work with Bryan I worked with Brett Ratner, it was just awesome. I feel so grateful to be back… Really, truly, it’s not like something I’ve known for a year by any means. I really didn’t know that long before we went to shoot.